//
//  WelcomeViewController.swift
//  云Sir的微博
//
//  Created by 赵云 on 15/10/12.
//  Copyright © 2015年 itcast. All rights reserved.
//

import UIKit
import SDWebImage
class WelcomeViewController: UIViewController {

    //设置底部约束
    private var iconBottomCons: NSLayoutConstraint?
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        prepareUI()

        //加载啊用户头像
        if let urlString = UserAccount.sharedAccount?.avatar_large{
            
        iconView.sd_setImageWithURL(NSURL(string: urlString)!)
        
        }
        
    }
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        // 提示：修改约束不会立即生效，添加了一个标记，统一由自动布局系统更新约束
        iconBottomCons?.constant = -UIScreen.mainScreen().bounds.height - iconBottomCons!.constant
        //写这个头像不会变化
        //        iconBottomCons?.constant = UIScreen().bounds.height - iconBottomCons!.constant

        
        // 动画
        UIView.animateWithDuration(1.2, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 5.0, options: UIViewAnimationOptions(rawValue: 0), animations: { () -> Void in
            
            // 强制更新约束
            self.view.layoutIfNeeded()
            
            }) { (_) -> Void in
                //发送通知
                NSNotificationCenter.defaultCenter().postNotificationName(ZYRootViewControllerSwicthNotification, object: true)
        }
    }

    //准备界面
    private func prepareUI() {
        view.addSubview(backImageView)
        view.addSubview(iconView)
        view.addSubview(label)
        
        //自动布局
        
        //1>背景图片
        /// 背景图片
        backImageView.ff_Fill(view)
        
        // 2> 头像
        let cons = iconView.ff_AlignInner(type: ff_AlignType.BottomCenter, referView: view, size: CGSize(width: 90, height: 90), offset: CGPoint(x: 0, y: -160))
        // 记录底边约束
        iconBottomCons = iconView.ff_Constraint(cons, attribute: NSLayoutAttribute.Bottom)
        
        // 3> 标签
        label.ff_AlignVertical(type: ff_AlignType.BottomCenter, referView: iconView, size: nil, offset: CGPoint(x: 0, y: 16))
    }
    
    
    //MARK: - 懒加载控件
    //背景图片
    private lazy var backImageView: UIImageView = UIImageView(image: UIImage(named: "ad_background"))
    
    //用户头像
    private lazy var iconView: UIImageView = {
        
        let iv = UIImageView(image: UIImage(named: "avatar_default_big"))
        iv.layer.masksToBounds = true
        iv.layer.cornerRadius = 45
        
        return iv
        
    }()
    
    //消息文字
    private lazy var label: UILabel = {
        
        let label = UILabel()
        label.text = "欢迎归来"
        label.sizeToFit()
        
        
        return label
    }()

}
